Note for building gd wiwith libpng-1.4

[Tatsuro M. <tma...@ya...>]

Hello

This is just a note for those who try to build the libgd with libpng-1.4.

I have update the libpng version of which is 1.4.
>From the libpng-1.4, the function 'png_check_sig' is removed.
The change makes the libgd building in failure.

./.libs/libgd.a(gd_png.o):gd_png.c:(.text+0xd20): undefined reference to `png_check_sig'

  The function png_check_sig can be replaced as 
      replace
        png_check_sig(buf, 8)
      with
        png_sig_cmp(buf, 0, 8) == 0
http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt

A patch has been posted the below,
http://bugs.libgd.org/?do=details&task_id=218&histring=png_check_sig

Regards

Tatsuro

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